[Bug 763321] Failed to play VAAPI HW JPEG decode for video clip with codec ID: MJPG

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763321

--- Comment #8 from sreerenj <bsreerenj at gmail.com> ---
In theory, Hi and Vi can have values from 1 to 4 as per Jpeg Spec. And there
could be other samples like this (with  different h_factor/v_facotr) which are
not decodable with the driver.

How about a more generalized approach:
-- write utility function to get the chroma_format
(SUBSAMPLE_YUV420,SUBSAMPLE_YUV422H etc) from h_factor/v_factor
-- if chromat_format != any of the GST_VAAPI_CHROMA_TYPE_* then return
GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CHROMA_FORMAT

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